Abstract A novel linear cationic ABCBA pentablock terpolymer composed of a positively charged poly (3-acrylamidopropyl) trimethyl ammonium chloride)) (PAMPTMA (+)) block at both ends and two thermoresponsive poly ( N -isopropylacrylamide) (PNIPAAM) blocks separated by a hydrophilic poly(ethylene glycol) (PEG) block was synthesized via a “one-pot” atom transfer radical polymerization procedure (ATRP). The chemical composition of the pentablock terpolymer was confirmed by nuclear magnetic resonance (NMR) and asymmetric flow field-flow fractionation (AFFFF). Depending on the polymer concentration in aqueous solution, this terpolymer forms unimers and self-assembled structures at elevated temperatures. The effect of concentration and temperature-induced self-assembling behavior of the pentablock terpolymer in aqueous solution was examined by using turbidimetry, shear viscosity, rheo-small angle light scattering (rheo-SALS), dynamic light scattering (DLS), and small angle neutron scattering (SANS). The turbidity measurements demonstrated that the formation of intermicellar structures and compaction of the complexes are function of both polymer concentration and temperature. The viscosity and rheo-SALS experiments elucidated the intricate interplay between building-up and breaking-up of interchain complexes under the influence of shear flow. The DLS experiments show the coexistence of small entities and interchain complexes at low temperatures and the evolution of large intermicellar structures at higher temperatures. At the highest temperatures, compaction of the complexes occurred. The results from SANS revealed significant temperature-induced changes of the copolymer structure on a semi-local dimensional scale.

中文翻译：

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水溶液中带正电荷的对称五嵌段三元共聚物的合成和温度诱导自组装

摘要 一种新型线性阳离子 ABCBA 五嵌段三元共聚物，由两端带正电荷的聚（3-丙烯酰胺丙基）三甲基氯化铵））（PAMPTMA（+））嵌段和两个热响应性聚（N-异丙基丙烯酰胺）（PNIPAAM）嵌段组成亲水性聚（乙二醇）（PEG）嵌段是通过“一锅”原子转移自由基聚合程序（ATRP）合成的。五嵌段三元共聚物的化学成分通过核磁共振 (NMR) 和不对称流场-流动分级 (AFFFF) 得到证实。根据水溶液中聚合物的浓度，这种三元共聚物在高温下形成单体和自组装结构。通过使用比浊法、剪切粘度、流变小角光散射 (rheo-SALS)、动态光散射 (DLS) 和小角中子散射 (SANS)。浊度测量表明，胶束间结构的形成和复合物的压实是聚合物浓度和温度的函数。粘度和流变-SALS 实验阐明了在剪切流影响下链间复合物的构建和分解之间的复杂相互作用。DLS 实验显示了低温下小实体和链间复合物的共存以及高温下大分子间结构的演变。在最高温度下，复合物发生压实。SANS 的结果揭示了共聚物结构在半局部尺寸尺度上的显着温度诱导变化。